Gerben,
Neither of the Dutch Lugers pictured have barrel dates.
The Vickers bore is very finely pitted throughout, and the lands are very nearly shot away--it should have been rebarrelled long since.
The KOL is not really a complete KOL. Although the frame is in the proper serial# ranrge, and the toggle train is a proper DWM Dutch assembly (Geladen on both sides of the extracter, the serial# modified in the proper fashion), the receiver is a garden-variety Crown/N Commercial, and the barrel is a (4") non-standard barrel. If anyone can identify the barrel marking...please, identify the marking!!
Does anyone have a Vickers which can be compared to the sample illustrated?
--Dwight